File Store not working while I want to attach image from uploaded images in server.

Please see above attachment. what i am looking for is when I want to attach image from uploaded images in server using "FRom the File STore" option I am unable to get lists of all images present in assets folder.

How to resolve this issue please guide me. also tell which files should i look for to fix this issue.

Looks like you're using the old formfield, have you tried using new UpoadField instead of the FileField? It has allows drag and drop uploads and uses nicer interface for the select from existing.

Though if the drop down isn't working could be a issue with the JavaScript that handles it. I've noticed that periodically it fails to fire correctly. I've been waiting for it to happen to me again so I could file a propper bug report